<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>

    </style>
</head>
<body>

</body>
<script>
    var windowWidth=document.documentElement.clientWidth||document.body.clientWidth;
    var windowHeight=document.documentElement.clientHeight||document.body.clientHeight;
    console.log(windowWidth);
    console.log(windowHeight)
</script>
</html>